SINGAPORE: National water agency PUB on Monday (Sep 11) announced the appointment of three contractors to design and build the second phase of the Deep Tunnel Sewerage System (DTSS).

The three contractors are the joint venture of Penta-Ocean Construction and Koh Brothers Building & Civil Engineering Contractors, Ed Zublin AG and Leighton Contractors.

The DTSS uses deep tunnel sewers to convey used water to water reclamation plants, which is then treated and purified to become NEWater.
The contractors, who were awarded after a pre-qualification and tender exercise in mid-2016, will develop a detailed design and construct 30km of deep tunnels and link sewers as well as the associated ancillary structures.

The three contracts are valued at a total of S$1.51 billion, said PUB.

This will be the first batch of the second phase, which is expected to be completed by 2025. This phase will extend DTSS to cover the western part of Singapore, including the downtown area and major upcoming developments such as Tengah Town.

There are also plans for a NEWater factory to be integrated with the Tuas water reclamation plant to facilitate water recycling.

Once Phase 2 is completed, the existing conventional water recycling plants at Ulu Pandan and Jurong, as well as intermediate pumping stations, will be progressively phased out and the land freed up, PUB said.

"The DTSS ensures the sustainability and resilience of the used water network to facilitate large-scale water recycling in Singapore, and contributes to the goal of increasing the overall water recycling rate from 40 per cent to up to 55 per cent of total water demand in the long term," said Mr Yong Wei Hin, director of the project at PUB.
Source: CNA/ad

Contracts given for Phase 2 of deep-tunnel sewer system
Jose Hong Straits Times 11 Sep 17;

PUB, Singapore's national water agency, appointed three contractors yesterday to design and build the first batch of deep tunnels and link sewers for the Deep Tunnel Sewerage System (DTSS) Phase 2.

Over the next seven years, the three contractors will design and construct about 30km of deep tunnels and link sewers, as well as their supporting structures.

Construction will begin at the end of this year. In total, the contracts are worth $1.51 billion.

The three contractors are the Singapore branch of Ed Zublin AG, a joint venture between Penta-Ocean Construction and Koh Brothers Building & Civil Engineering Contractor, and the Singapore branch of Leighton Contractors (Asia).

Their work will be part of a network of 40km of deep tunnels and 60km of link sewers for DTSS Phase 2.

The contracts for the rest of the network will be awarded from next year. By its expected completion in 2025, the DTSS will be connected to the Tuas Water Reclamation Plant. The DTSS will then transport used water from the whole of Singapore into three centralised water reclamation plants for treatment.

There, the water will either undergo more purification to make Newater, or it will be discharged into the sea.

Mr Yong Wei Hin, director of DTSS Phase 2 at PUB, said: "As the backbone of Newater production, the DTSS ensures the sustainability and resilience of the used-water network to facilitate large-scale water recycling in Singapore."

He added that this "contributes to the goal of increasing the overall water-recycling rate from 40 per cent to up to 55 per cent of total water demand in the long term"

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